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Microphonics Squeal -Source?


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We’ve been experiencing a very high pitched squeal above 10 Khz and can’t isolate the source.

 

location: the sound seems to comes from the ceiling area around the maxxair fan

We have turned off all items including the tv, radio, fans, water heater, furnaces etc. to isolate the source.  
 

at random times the squeal comes back.

 

Anyone else had this issue? 

 

 

2019 Elite II (Hull 505 - Galway Girl - August 7, 2019 Delivery) 
Tow Vehicle: 2021 F350 King Ranch, FX4, MaxTow Package, 10 Speed, 3.55 Rear Axle
Batteries Upgrade: Dual 315GTX Lithionics Lithiums - 630AH Total
Inverter/Charger: Xantrex 2000Pro 

BLOG:  https://4-ever-hitched.com

Amazon Oliver Outfitters Guide:  https://amzn.to/2mAAgPO

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Have you disconnected from shore power to see if the noise goes away then?

2019 Oliver Legacy Elite II - Hull #461

Tow Vehicles:

Primary - 2019 Ford F-250 SuperCab 4x4, 6.2L Flex-Fuel engine 

Backup - 2019 Nissan Armada 

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Will try disconnecting from shore power to see …the sound is intermittent, and only is on for a few seconds.

I’m suspecting oscillation on a circuit board the goes away when energy drops. 
Sound is loudest up by the Maxxair Fan above stove.

2019 Elite II (Hull 505 - Galway Girl - August 7, 2019 Delivery) 
Tow Vehicle: 2021 F350 King Ranch, FX4, MaxTow Package, 10 Speed, 3.55 Rear Axle
Batteries Upgrade: Dual 315GTX Lithionics Lithiums - 630AH Total
Inverter/Charger: Xantrex 2000Pro 

BLOG:  https://4-ever-hitched.com

Amazon Oliver Outfitters Guide:  https://amzn.to/2mAAgPO

ALAZCAFLGAIDILINKSKYLAMIMNMSMOMTNENMNCOR

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Is your Maxx Air fan partially open?  They are "Stiff/Tight" only when open or fully closed.

GJ

PS:  Fried another brain cell.  How about the bathroom exhaust fan.  Maybe a bearing squeak.

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Tug:  2019 F-150 SuperCrew Lariat, 3.5L EcoBoost, Max Trailer Tow, FX-4, 4X4, Rear Locker

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